Method for transmitting and receiving signal by terminal in wireless communication system

ABSTRACT

An embodiment relates to a method for a first terminal operating in a wireless communication system, the method comprising the steps of: transmitting application information from an application layer to a vehicle-to-everything (V2X) layer; generating, in the V2X layer, sidelink (SL) discontinuous reception (DRX) information on the basis of the application information; transmitting the SL DRX information from the V2X layer to an AS layer; and communicating with a second terminal by applying the SL DRX information in the AS layer, wherein the application information includes at least one application requirement.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No.PCT/KR2021/000196, filed on Jan. 7, 2021, which claims the benefit ofKorean Application No. 10-2020-0002197, filed on Jan. 7, 2020. Thedisclosures of the prior applications are incorporated by reference intheir entirety.

TECHNICAL FIELD

The following description relates to a wireless communication system,and more particularly, to a method and apparatus for configuring asidelink (SL) discontinuous reception (DRX) configuration by a userequipment (UE).

BACKGROUND

Wireless communication systems have been widely deployed to providevarious types of communication services such as voice or data. Ingeneral, a wireless communication system is a multiple access systemthat supports communication of multiple users by sharing availablesystem resources (a bandwidth, transmission power, etc.). Examples ofmultiple access systems include a code division multiple access (CDMA)system, a frequency division multiple access (FDMA) system, a timedivision multiple access (TDMA) system, an orthogonal frequency divisionmultiple access (OFDMA) system, a single carrier frequency divisionmultiple access (SC-FDMA) system, and a multi carrier frequency divisionmultiple access (MC-FDMA) system.

A wireless communication system uses various radio access technologies(RATs) such as long term evolution (LTE), LTE-advanced (LTE-A), andwireless fidelity (WiFi). 5th generation (5G) is such a wirelesscommunication system. Three key requirement areas of 5G include (1)enhanced mobile broadband (eMBB), (2) massive machine type communication(mMTC), and (3) ultra-reliable and low latency communications (URLLC).Some use cases may require multiple dimensions for optimization, whileothers may focus only on one key performance indicator (KPI). 5Gsupports such diverse use cases in a flexible and reliable way.

eMBB goes far beyond basic mobile Internet access and covers richinteractive work, media and entertainment applications in the cloud oraugmented reality (AR). Data is one of the key drivers for 5G and in the5G era, we may for the first time see no dedicated voice service. In 5G,voice is expected to be handled as an application program, simply usingdata connectivity provided by a communication system. The main driversfor an increased traffic volume are the increase in the size of contentand the number of applications requiring high data rates. Streamingservices (audio and video), interactive video, and mobile Internetconnectivity will continue to be used more broadly as more devicesconnect to the Internet. Many of these applications require always-onconnectivity to push real time information and notifications to users.Cloud storage and applications are rapidly increasing for mobilecommunication platforms. This is applicable for both work andentertainment. Cloud storage is one particular use case driving thegrowth of uplink data rates. 5G will also be used for remote work in thecloud which, when done with tactile interfaces, requires much lowerend-to-end latencies in order to maintain a good user experience.Entertainment, for example, cloud gaming and video streaming, is anotherkey driver for the increasing need for mobile broadband capacity.Entertainment will be very essential on smart phones and tabletseverywhere, including high mobility environments such as trains, carsand airplanes. Another use case is augmented reality (AR) forentertainment and information search, which requires very low latenciesand significant instant data volumes.

One of the most expected 5G use cases is the functionality of activelyconnecting embedded sensors in every field, that is, mMTC. It isexpected that there will be 20.4 billion potential Internet of things(IoT) devices by 2020. In industrial IoT, 5G is one of areas that playkey roles in enabling smart city, asset tracking, smart utility,agriculture, and security infrastructure.

URLLC includes services which will transform industries withultra-reliable/available, low latency links such as remote control ofcritical infrastructure and self-driving vehicles. The level ofreliability and latency are vital to smart-grid control, industrialautomation, robotics, drone control and coordination, and so on.

Now, multiple use cases will be described in detail.

5G may complement fiber-to-the home (FTTH) and cable-based broadband (ordata-over-cable service interface specifications (DOCSIS)) as a means ofproviding streams at data rates of hundreds of megabits per second togiga bits per second. Such a high speed is required for TV broadcasts ator above a resolution of 4K (6K, 8K, and higher) as well as virtualreality (VR) and AR. VR and AR applications mostly include immersivesport games. A special network configuration may be required for aspecific application program. For VR games, for example, game companiesmay have to integrate a core server with an edge network server of anetwork operator in order to minimize latency.

The automotive sector is expected to be a very important new driver for5G, with many use cases for mobile communications for vehicles. Forexample, entertainment for passengers requires simultaneous highcapacity and high mobility mobile broadband, because future users willexpect to continue their good quality connection independent of theirlocation and speed. Other use cases for the automotive sector are ARdashboards. These display overlay information on top of what a driver isseeing through the front window, identifying objects in the dark andtelling the driver about the distances and movements of the objects. Inthe future, wireless modules will enable communication between vehiclesthemselves, information exchange between vehicles and supportinginfrastructure and between vehicles and other connected devices (e.g.,those carried by pedestrians). Safety systems may guide drivers onalternative courses of action to allow them to drive more safely andlower the risks of accidents. The next stage will be remote-controlledor self-driving vehicles. These require very reliable, very fastcommunication between different self-driving vehicles and betweenvehicles and infrastructure. In the future, self-driving vehicles willexecute all driving activities, while drivers are focusing on trafficabnormality elusive to the vehicles themselves. The technicalrequirements for self-driving vehicles call for ultra-low latencies andultra-high reliability, increasing traffic safety to levels humanscannot achieve.

Smart cities and smart homes, often referred to as smart society, willbe embedded with dense wireless sensor networks. Distributed networks ofintelligent sensors will identify conditions for cost- andenergy-efficient maintenance of the city or home. A similar setup can bedone for each home, where temperature sensors, window and heatingcontrollers, burglar alarms, and home appliances are all connectedwirelessly. Many of these sensors are typically characterized by lowdata rate, low power, and low cost, but for example, real time highdefinition (HD) video may be required in some types of devices forsurveillance.

The consumption and distribution of energy, including heat or gas, isbecoming highly decentralized, creating the need for automated controlof a very distributed sensor network. A smart grid interconnects suchsensors, using digital information and communications technology togather and act on information. This information may include informationabout the behaviors of suppliers and consumers, allowing the smart gridto improve the efficiency, reliability, economics and sustainability ofthe production and distribution of fuels such as electricity in anautomated fashion. A smart grid may be seen as another sensor networkwith low delays.

The health sector has many applications that may benefit from mobilecommunications. Communications systems enable telemedicine, whichprovides clinical health care at a distance. It helps eliminate distancebarriers and may improve access to medical services that would often notbe consistently available in distant rural communities. It is also usedto save lives in critical care and emergency situations. Wireless sensornetworks based on mobile communication may provide remote monitoring andsensors for parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly importantfor industrial applications. Wires are expensive to install andmaintain, and the possibility of replacing cables with reconfigurablewireless links is a tempting opportunity for many industries. However,achieving this requires that the wireless connection works with asimilar delay, reliability and capacity as cables and that itsmanagement is simplified. Low delays and very low error probabilitiesare new requirements that need to be addressed with 5G.

Finally, logistics and freight tracking are important use cases formobile communications that enable the tracking of inventory and packageswherever they are by using location-based information systems. Thelogistics and freight tracking use cases typically require lower datarates but need wide coverage and reliable location information.

A wireless communication system is a multiple access system thatsupports communication of multiple users by sharing available systemresources (a bandwidth, transmission power, etc.). Examples of multipleaccess systems include a CDMA system, an FDMA system, a TDMA system, anOFDMA system, an SC-FDMA system, and an MC-FDMA system.

Sidelink (SL) refers to a communication scheme in which a direct link isestablished between user equipments (UEs) and the UEs directly exchangevoice or data without intervention of a base station (BS). SL isconsidered as a solution of relieving the BS of the constraint ofrapidly growing data traffic.

Vehicle-to-everything (V2X) is a communication technology in which avehicle exchanges information with another vehicle, a pedestrian, andinfrastructure by wired/wireless communication. V2X may be categorizedinto four types: vehicle-to-vehicle (V2V), vehicle-to-infrastructure(V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). V2Xcommunication may be provided via a PC5 interface and/or a Uu interface.

As more and more communication devices demand larger communicationcapacities, there is a need for enhanced mobile broadband communicationrelative to existing RATs. Accordingly, a communication system is underdiscussion, for which services or UEs sensitive to reliability andlatency are considered. The next-generation RAT in which eMBB, MTC, andURLLC are considered is referred to as new RAT or NR. In NR, V2Xcommunication may also be supported.

FIG. 1 is a diagram illustrating V2X communication based on pre-NR RATand V2X communication based on NR in comparison.

For V2X communication, a technique of providing safety service based onV2X messages such as basic safety message (BSM), cooperative awarenessmessage (CAM), and decentralized environmental notification message(DENM) was mainly discussed in the pre-NR RAT. The V2X message mayinclude location information, dynamic information, and attributeinformation. For example, a UE may transmit a CAM of a periodic messagetype and/or a DENM of an event-triggered type to another UE.

For example, the CAM may include basic vehicle information includingdynamic state information such as a direction and a speed, vehiclestatic data such as dimensions, an external lighting state, pathdetails, and so on. For example, the UE may broadcast the CAM which mayhave a latency less than 100 ms. For example, when an unexpectedincident occurs, such as breakage or an accident of a vehicle, the UEmay generate the DENM and transmit the DENM to another UE. For example,all vehicles within the transmission range of the UE may receive the CAMand/or the DENM. In this case, the DENM may have priority over the CAM.

In relation to V2X communication, various V2X scenarios are presented inNR. For example, the V2X scenarios include vehicle platooning, advanceddriving, extended sensors, and remote driving.

For example, vehicles may be dynamically grouped and travel togetherbased on vehicle platooning. For example, to perform platoon operationsbased on vehicle platooning, the vehicles of the group may receiveperiodic data from a leading vehicle. For example, the vehicles of thegroup may widen or narrow their gaps based on the periodic data.

For example, a vehicle may be semi-automated or full-automated based onadvanced driving. For example, each vehicle may adjust a trajectory ormaneuvering based on data obtained from a nearby vehicle and/or a nearbylogical entity. For example, each vehicle may also share a dividingintention with nearby vehicles.

Based on extended sensors, for example, raw or processed data obtainedthrough local sensor or live video data may be exchanged betweenvehicles, logical entities, terminals of pedestrians and/or V2Xapplication servers. Accordingly, a vehicle may perceive an advancedenvironment relative to an environment perceivable by its sensor.

Based on remote driving, for example, a remote driver or a V2Xapplication may operate or control a remote vehicle on behalf of aperson incapable of driving or in a dangerous environment. For example,when a path may be predicted as in public transportation, cloudcomputing-based driving may be used in operating or controlling theremote vehicle. For example, access to a cloud-based back-end serviceplatform may also be used for remote driving.

A scheme of specifying service requirements for various V2X scenariosincluding vehicle platooning, advanced driving, extended sensors, andremote driving is under discussion in NR-based V2X communication.

SUMMARY

Embodiment(s) is intended to provide a method of generating a sidelink(SL) discontinuous reception (DRX) configuration in consideration ofservice requirements by a user equipment (UE).

It will be appreciated by persons skilled in the art that the objectsthat could be achieved with the present disclosure are not limited towhat has been particularly described hereinabove and the above and otherobjects that the present disclosure could achieve will be more clearlyunderstood from the following detailed description.

An embodiment is a method for a first user equipment (UE) operating in awireless communication system, including transmitting applicationinformation from an application layer to a vehicle-to-everything (V2X)layer, generating sidelink (SL) discontinuous reception (DRX)information based on the application information in the V2X layer,transmitting the SL DRX information from the V2X layer to an accessstratum (AS) layer, and communicating with a second UE by applying theSL DRX information in the AS layer. The application information includesat least one application requirement.

An embodiment is a first UE in a wireless communication system,including at least one processor, and at least one computer memoryoperably coupled to the at least one processor and storing instructionswhich when executed, cause the at least one processor to performoperations. The operations include transmitting application informationfrom an application layer to a V2X layer, generating SL DRX informationbased on the application information in the V2X layer, transmitting theSL DRX information from the V2X layer to an AS layer, and communicatingwith a second UE by applying the SL DRX information in the AS layer. Theapplication information includes at least one application requirement.

An embodiment is a computer-readable storage medium storing instructionswhich when executed, cause at least one processor to perform operationsfor a UE. The operations include transmitting application informationfrom an application layer to a V2X layer, generating SL DRX informationbased on the application information in the V2X layer, transmitting theSL DRX information from the V2X layer to an AS layer, and communicatingwith a second UE by applying the SL DRX information in the AS layer. Theapplication information includes at least one application requirement.

The application information may further include information about atleast one service type.

The SL DRX information may include at least one of SLdrx-onDurationTimer, SL drx-SlotOffset, SL drx-InactivityTimer, SLdrx-RetransmissionTimer, SL drx-LongCycleStartOffset, SL drx-ShortCycle,SL drx-ShortCycleTimer, or SL drx-HARQ-RTT-Timer.

The SL DRX information may be broadcast to other UEs which are notconnected to the first UE.

The SL DRX information may be transmitted to the second UE through aphysical sidelink broadcast channel (PSBCH).

The SL DRX information may be transmitted to the second UE throughsecond sidelink control information (SCI).

First SCI may include an indicator indicating whether the SL DRXinformation is included in the second SCI.

When a part of the SL DRX information is included in the second SCI,remaining SL DRX information may be transmitted to the second UE througha physical sidelink shared channel (PSSCH).

The second SCI may include an indicator indicating whether the remainingSL DRX information is included in the PSSCH.

The SL DRX information may be transmitted to the second UE through aPSSCH.

The first UE may communicate with at least one of another UE, a UErelated to an autonomous driving vehicle, a base station, or a network.

According to an embodiment, a user equipment (UE) may generate asidelink (SL) discontinuous reception (DRX) configuration inconsideration of service requirements at a vehicle-to-everything (V2X)layer, without signaling with a base station (BS).

It will be appreciated by persons skilled in the art that the effectsthat can be achieved with the present disclosure are not limited to whathas been particularly described hereinabove and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure, provide embodiments of the presentdisclosure together with detail explanation.

FIG. 1 is a diagram illustrating vehicle-to-everything (V2X)communication based on pre-new radio access technology (NR) RAT and V2Xcommunication based on NR in comparison;

FIG. 2 is a diagram illustrating the structure of a long term evolution(LTE) system according to an embodiment of the present disclosure;

FIGS. 3A and 3B are diagrams illustrating user-plane and control-planeradio protocol architectures according to an embodiment of the presentdisclosure;

FIG. 4 is a diagram illustrating the structure of an NR system accordingto an embodiment of the present disclosure;

FIG. 5 is a diagram illustrating functional split between a nextgeneration radio access network (NG-RAN) and a 5th generation corenetwork (5GC) according to an embodiment of the present disclosure;

FIGS. 6A to 6C are diagrams illustrating three cast types according toan embodiment of the present disclosure;

FIGS. 7 to 13 are diagrams for explaining embodiment(s); and

FIGS. 14 to 23 are block diagrams illustrating various devicesapplicable to embodiment(s) of the present disclosure.

DETAILED DESCRIPTION

In various embodiments of the present disclosure, “/” and “,” should beinterpreted as “and/or”. For example, “A/B” may mean “A and/or B”.Further, “A, B” may mean “A and/or B”. Further, “A/B/C” may mean “atleast one of A, B and/or C”. Further, “A, B, C” may mean “at least oneof A, B and/or C”.

In various embodiments of the present disclosure, “or” should beinterpreted as “and/or”. For example, “A or B” may include “only A”,“only B”, and/or “both A and B”. In other words, “or” should beinterpreted as “additionally or alternatively”.

Techniques described herein may be used in various wireless accesssystems such as code division multiple access (CDMA), frequency divisionmultiple access (FDMA), time division multiple access (TDMA), orthogonalfrequency division multiple access (OFDMA), single carrier-frequencydivision multiple access (SC-FDMA), and so on. CDMA may be implementedas a radio technology such as universal terrestrial radio access (UTRA)or CDMA2000. TDMA may be implemented as a radio technology such asglobal system for mobile communications (GSM)/general packet radioservice (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE). OFDMA maybe implemented as a radio technology such as IEEE 802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE 802.20, evolved-UTRA (E-UTRA), or the like. IEEE802.16m is an evolution of IEEE 802.16e, offering backward compatibilitywith an IRRR 802.16e-based system. UTRA is a part of universal mobiletelecommunications system (UMTS). 3rd generation partnership project(3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS)using evolved UTRA (E-UTRA). 3GPP LTE employs OFDMA for downlink (DL)and SC-FDMA for uplink (UL). LTE-advanced (LTE-A) is an evolution of3GPP LTE.

A successor to LTE-A, 5th generation (5G) new radio access technology(NR) is a new clean-state mobile communication system characterized byhigh performance, low latency, and high availability. 5G NR may use allavailable spectral resources including a low frequency band below 1 GHz,an intermediate frequency band between 1 GHz and 10 GHz, and a highfrequency (millimeter) band of 24 GHz or above.

While the following description is given mainly in the context of LTE-Aor 5G NR for the clarity of description, the technical idea of anembodiment of the present disclosure is not limited thereto.

FIG. 2 illustrates the structure of an LTE system according to anembodiment of the present disclosure. This may also be called an evolvedUMTS terrestrial radio access network (E-UTRAN) or LTE/LTE-A system.

Referring to FIG. 2 , the E-UTRAN includes evolved Node Bs (eNBs) 20which provide a control plane and a user plane to UEs 10. A UE 10 may befixed or mobile, and may also be referred to as a mobile station (MS),user terminal (UT), subscriber station (SS), mobile terminal (MT), orwireless device. An eNB 20 is a fixed station communication with the UE10 and may also be referred to as a base station (BS), a basetransceiver system (BTS), or an access point.

eNBs 20 may be connected to each other via an X2 interface. An eNB 20 isconnected to an evolved packet core (EPC) 39 via an S1 interface. Morespecifically, the eNB 20 is connected to a mobility management entity(MME) via an S1-MME interface and to a serving gateway (S-GW) via anS1-U interface.

The EPC 30 includes an MME, an S-GW, and a packet data network-gateway(P-GW). The MME has access information or capability information aboutUEs, which are mainly used for mobility management of the UEs. The S-GWis a gateway having the E-UTRAN as an end point, and the P-GW is agateway having a packet data network (PDN) as an end point.

Based on the lowest three layers of the open system interconnection(OSI) reference model known in communication systems, the radio protocolstack between a UE and a network may be divided into Layer 1 (L1), Layer2 (L2) and Layer 3 (L3). These layers are defined in pairs between a UEand an Evolved UTRAN (E-UTRAN), for data transmission via the Uuinterface. The physical (PHY) layer at L1 provides an informationtransfer service on physical channels. The radio resource control (RRC)layer at L3 functions to control radio resources between the UE and thenetwork. For this purpose, the RRC layer exchanges RRC messages betweenthe UE and an eNB.

FIG. 3A illustrates a user-plane radio protocol architecture accordingto an embodiment of the disclosure.

FIG. 3B illustrates a control-plane radio protocol architectureaccording to an embodiment of the disclosure. A user plane is a protocolstack for user data transmission, and a control plane is a protocolstack for control signal transmission.

Referring to FIGS. 3A and A3, the PHY layer provides an informationtransfer service to its higher layer on physical channels. The PHY layeris connected to the medium access control (MAC) layer through transportchannels and data is transferred between the MAC layer and the PHY layeron the transport channels. The transport channels are divided accordingto features with which data is transmitted via a radio interface.

Data is transmitted on physical channels between different PHY layers,that is, the PHY layers of a transmitter and a receiver. The physicalchannels may be modulated in orthogonal frequency division multiplexing(OFDM) and use time and frequencies as radio resources.

The MAC layer provides services to a higher layer, radio link control(RLC) on logical channels. The MAC layer provides a function of mappingfrom a plurality of logical channels to a plurality of transportchannels. Further, the MAC layer provides a logical channel multiplexingfunction by mapping a plurality of logical channels to a singletransport channel. A MAC sublayer provides a data transmission serviceon the logical channels.

The RLC layer performs concatenation, segmentation, and reassembly forRLC serving data units (SDUs). In order to guarantee various quality ofservice (QoS) requirements of each radio bearer (RB), the RLC layerprovides three operation modes, transparent mode (TM), unacknowledgedmode (UM), and acknowledged Mode (AM). An AM RLC provides errorcorrection through automatic repeat request (ARQ).

The RRC layer is defined only in the control plane and controls logicalchannels, transport channels, and physical channels in relation toconfiguration, reconfiguration, and release of RBs. An RB refers to alogical path provided by L1 (the PHY layer) and L2 (the MAC layer, theRLC layer, and the packet data convergence protocol (PDCP) layer), fordata transmission between the UE and the network.

The user-plane functions of the PDCP layer include user datatransmission, header compression, and ciphering. The control-planefunctions of the PDCP layer include control-plane data transmission andciphering/integrity protection.

RB establishment amounts to a process of defining radio protocol layersand channel features and configuring specific parameters and operationmethods in order to provide a specific service. RBs may be classifiedinto two types, signaling radio bearer (SRB) and data radio bearer(DRB). The SRB is used as a path in which an RRC message is transmittedon the control plane, whereas the DRB is used as a path in which userdata is transmitted on the user plane.

Once an RRC connection is established between the RRC layer of the UEand the RRC layer of the E-UTRAN, the UE is placed in RRC_CONNECTEDstate, and otherwise, the UE is placed in RRC_IDLE state. In NR,RRC_INACTIVE state is additionally defined. A UE in the RRC_INACTIVEstate may maintain a connection to a core network, while releasing aconnection from an eNB.

DL transport channels carrying data from the network to the UE include abroadcast channel (BCH) on which system information is transmitted and aDL shared channel (DL SCH) on which user traffic or a control message istransmitted. Traffic or a control message of a DL multicast or broadcastservice may be transmitted on the DL-SCH or a DL multicast channel (DLMCH). UL transport channels carrying data from the UE to the networkinclude a random access channel (RACH) on which an initial controlmessage is transmitted and an UL shared channel (UL SCH) on which usertraffic or a control message is transmitted.

The logical channels which are above and mapped to the transportchannels include a broadcast control channel (BCCH), a paging controlchannel (PCCH), a common control channel (CCCH), a multicast controlchannel (MCCH), and a multicast traffic channel (MTCH).

A physical channel includes a plurality of OFDM symbol in the timedomain by a plurality of subcarriers in the frequency domain. Onesubframe includes a plurality of OFDM symbols in the time domain. An RBis a resource allocation unit defined by a plurality of OFDM symbols bya plurality of subcarriers. Further, each subframe may use specificsubcarriers of specific OFDM symbols (e.g., the first OFDM symbol) in acorresponding subframe for a physical DL control channel (PDCCH), thatis, an L1/L2 control channel. A transmission time interval (TTI) is aunit time for subframe transmission.

FIG. 4 illustrates the structure of an NR system according to anembodiment of the present disclosure.

Referring to FIG. 4 , a next generation radio access network (NG-RAN)may include a next generation Node B (gNB) and/or an eNB, which providesuser-plane and control-plane protocol termination to a UE. In FIG. 4 ,the NG-RAN is shown as including only gNBs, by way of example. A gNB andan eNB are connected to each other via an Xn interface. The gNB and theeNB are connected to a 5G core network (5GC) via an NG interface. Morespecifically, the gNB and the eNB are connected to an access andmobility management function (AMF) via an NG-C interface and to a userplane function (UPF) via an NG-U interface.

FIG. 5 illustrates functional split between the NG-RAN and the 5GCaccording to an embodiment of the present disclosure.

Referring to FIG. 5 , a gNB may provide functions including inter-cellradio resource management (RRM), radio admission control, measurementconfiguration and provision, and dynamic resource allocation. The AMFmay provide functions such as non-access stratum (NAS) security andidle-state mobility processing. The UPF may provide functions includingmobility anchoring and protocol data unit (PDU) processing. A sessionmanagement function (SMF) may provide functions including UE Internetprotocol (IP) address allocation and PDU session control.

Now, a description will be given of V2X or sidelink (SL) communication.

SCI will be described below.

While control information transmitted from a BS to a UE on a PDCCH isreferred to as DCI, control information transmitted from one UE toanother UE on a PSCCH may be referred to as SCI. For example, the UE mayknow the starting symbol of the PSCCH and/or the number of symbols inthe PSCCH before decoding the PSCCH. For example, the SCI may include SLscheduling information. For example, the UE may transmit at least oneSCI to another UE to schedule the PSSCH. For example, one or more SCIformats may be defined.

For example, the transmitting UE may transmit the SCI to the receivingUE on the PSCCH. The receiving UE may decode one SCI to receive thePSSCH from the transmitting UE.

For example, the transmitting UE may transmit two consecutive SCIs(e.g., 2-stage SCI) on the PSCCH and/or PSSCH to the receiving UE. Thereceiving UE may decode the two consecutive SCIs (e.g., 2-stage SCI) toreceive the PSSCH from the transmitting UE. For example, when SCIconfiguration fields are divided into two groups in consideration of a(relatively) large SCI payload size, SCI including a first SCIconfiguration field group is referred to as first SCI. SCI including asecond SCI configuration field group may be referred to as second SCI.For example, the transmitting UE may transmit the first SCI to thereceiving UE on the PSCCH. For example, the transmitting UE may transmitthe second SCI to the receiving UE on the PSCCH and/or PSSCH. Forexample, the second SCI may be transmitted to the receiving UE on an(independent) PSCCH or on a PSSCH in which the second SCI is piggybackedto data. For example, the two consecutive SCIs may be applied todifferent transmissions (e.g., unicast, broadcast, or groupcast).

For example, the transmitting UE may transmit all or part of thefollowing information to the receiving UE by SCI. For example, thetransmitting UE may transmit all or part of the following information tothe receiving UE by first SCI and/or second SCI.

-   -   PSSCH-related and/or PSCCH-related resource allocation        information, for example, the positions/number of time/frequency        resources, resource reservation information (e.g. a        periodicity), and/or    -   an SL channel state information (CSI) report request indicator        or SL (L1) RSRP (and/or SL (L1) reference signal received        quality (RSRQ) and/or SL (L1) received signal strength indicator        (RSSI)) report request indicator, and/or    -   an SL CSI transmission indicator (on PSSCH) (or SL (L1) RSRP        (and/or SL (L1) RSRQ and/or SL (L1) RSSI) information        transmission indicator), and/or    -   MCS information, and/or    -   transmission power information, and/or    -   L1 destination ID information and/or L1 source ID information,        and/or    -   SL HARQ process ID information, and/or    -   new data indicator (NDI) information, and/or    -   redundancy version (RV) information, and/or    -   QoS information (related to transmission traffic/packet), for        example, priority information, and/or    -   An SL CSI-RS transmission indicator or information about the        number of SL CSI-RS antenna ports (to be transmitted);    -   Location information about a transmitting UE or location (or        distance area) information about a target receiving UE        (requested to transmit an SL HARQ feedback), and/or    -   RS (e.g., DMRS or the like) information related to decoding        and/or channel estimation of data transmitted on a PSSCH, for        example, information related to a pattern of (time-frequency)        mapping resources of the DMRS, rank information, and antenna        port index information.

For example, the first SCI may include information related to channelsensing. For example, the receiving UE may decode the second SCI usingthe PSSCH DMRS. A polar code used for the PDCCH may be applied to thesecond SCI. For example, the payload size of the first SCI may be equalfor unicast, groupcast and broadcast in a resource pool. After decodingthe first SCI, the receiving UE does not need to perform blind decodingon the second SCI. For example, the first SCI may include schedulinginformation about the second SCI.

In various embodiments of the present disclosure, since the transmittingUE may transmit at least one of the SCI, the first SCI, or the secondSCI to the receiving UE on the PSCCH, the PSCCH may be replaced with atleast one of the SCI, the first SCI, or the second SC. Additionally oralternatively, for example, the SCI may be replaced with at least one ofthe PSCCH, the first SCI, or the second SCI. Additionally oralternatively, for example, since the transmitting UE may transmit thesecond SCI to the receiving UE on the PSSCH, the PSSCH may be replacedwith the second SCI.

FIGS. 6A to 6C illustrate three cast types according to an embodiment ofthe present disclosure.

Specifically, FIG. 6A illustrates broadcast-type SL communication, FIG.6B illustrates unicast-type SL communication, and FIG. 6C illustratesgroupcast-type SL communication. In unicast-type SL communication, a UEmay perform one-to-one communication with another UE. In groupcast-typeSL communication, the UE may perform SL communication with one or moreUEs of a group to which the UE belongs. In various embodiments of thepresent disclosure, SL groupcast communication may be replaced with SLmulticast communication, SL one-to-many communication, and so on.

Now, RRC connection establishment between UEs will be described.

For V2X or SL communication, a transmitting UE may need to establish a(PC5) RRC connection with a receiving UE. For example, a UE may obtain aV2X-specific SIB. For a UE with data to be transmitted, which isconfigured with V2X or SL transmission by a higher layer, when at leasta frequency configured for transmission of the UE for SL communicationis included in the V2X-specific SIB, the UE may establish an RRCconnection with another UE without including a transmission resourcepool for the frequency. For example, once the RRC connection isestablished between the transmitting UE and the receiving UE, thetransmitting UE may perform unicast communication with the receiving UEvia the established RRC connection.

When the RRC connection is established between the UEs, the transmittingUE may transmit an RRC message to the receiving UE.

EMBODIMENTS

Release 17 NR V2X supports a sidelink (SL) discontinuous reception (DRX)operation of a UE. When the DRX operation of the V2X UE is supported,the following problem may occur.

Despite the absence of a PC5 RRC connection established between V2X UEs,the V2X UEs may transmit and receive a connectionless groupcast messageand/or a broadcast message. However, when the UEs operate in a DRX mode,a receiving (RX) UE may fail to receive a message from a transmitting(TX) UE unless the TX UE transmits the message in a DRX On-Duration ofthe RX UE. This is because without any PC5 RRC connection between the TXUE and the RX UE, there is no way to share DRX configurations betweenthe UEs and thus each UE has no knowledge of the DRX configuration ofthe other UE. That is, the TX UE may transmit a message outside the DRXOn-Duration of the RX UE.

In other words, information about the DRX configurations of the UEs isconventionally transmitted in a PC5 RRC connected state. Accordingly,when the TX UE transmits a message to the RX UE before a PC5 RRCconnection is established, the TX UE may transmit the message outsidethe DRX On-Duration of the RX UE.

In this context, the present disclosure provides a method and apparatusfor enabling a TX UE to obtain the DRX configuration of an RX UE in acommunication situation in which no PC5 RRC connection is establishedbetween the TX UE and the RX UE. According to the method disclosed inthe disclosure, the TX UE may transmit a groupcast/broadcast message inthe DRX On-Duration of the RX UE despite no connection between the UEs.

Various proposals described below may be applied independently or one ormore of them may be applied in combination.

1. Embodiment 1

According to an embodiment of the present disclosure, it is proposedthat a UE supporting DRX broadcasts its own SL DRX configuration (a DRXconfiguration for PSCCH or SCI monitoring) to a neighboring UE on asidelink broadcast channel (SL BCH).

For example, the UE may broadcast the SL DRX configuration to theneighboring UE by an initial PC5-S broadcast message (i.e., PC5-S DirectCommunication Request). When the UE broadcasts the SL DRX configurationby the PC5-S Direct Communication Request, the UE receiving the PC5-SDirect Communication Request may only obtain the SL DRX configuration ofthe UE without transmitting a response (i.e., PC5-S Direct CommunicationAccept) to the PC5-S Direct Communication Request. When the UE respondsto the PC5-S Direct Communication Request, a PC5 unicast connection maybe established. Therefore, the UE may obtain only DRX informationwithout transmitting a response.

The SL DRX configuration transmitted on the SL BCH may includeinformation of Table 1.

TABLE 1 Sidelink DRX configurations SL drx-onDurationTimer: the durationat the beginning of a DRX Cycle; SL drx-SlotOffset: the delay beforestarting the drx-onDurationTimer; SL drx-InactivityTimer: the durationafter the PSCCH occasion in which a PDCCH indicates a new UL or DLtransmission for the MAC entity; SL drx-RetransmissionTimer (per HARQprocess): the maximum duration until a retransmission is received; SLdrx-LongCycleStartOffset: the Long DRX cycle and drx-StartOffset whichdefines the subframe where the Long and Short DRX Cycle starts; SLdrx-ShortCycle (optional): the Short DRX cycle; SL drx-ShortCycle Timer(optional): the duration the UE shall follow the Short DRX cycle; SLdrx-HARQ-RTT-Timer (per HARQ process): the minimum duration before aassignment for HARQ retransmission is expected by the MAC entity;

The UE may obtain SL DRX configuration information about a neighboringUE by receiving an SL BCH from the neighboring UE. Therefore, the TX UEmay obtain the SL DRX configuration of the RX UE without establishing aPC5 RRC connection with the RX UE, and thus transmit a groupcast messageand/or a broadcast message in the SL DRX On-Duration of the RX UE.

FIG. 7 is a diagram illustrating an embodiment of the presentdisclosure.

Referring to FIG. 7 , UE2 may transmit a message including its own SLDRX configuration to UE1 on an SL BCH. UE1 may transmit a groupcastmessage and/or a broadcast message in the SL DRX On-Duration of UE2based on the SL DRX configuration of UE2, without a PC5 RRC connectionwith UE2.

2. Embodiment 2

According to an embodiment of the present disclosure, a UE supportingDRX may transmit its own SL DRX configuration (a DRX configuration forPSCCH or SCI monitoring) to a neighboring UE on a PSCCH (by second SCI).

The SL DRX configuration transmitted by the second SCI may includeinformation described in Table 2.

TABLE 2 Sidelink DRX configurations SL drx-onDurationTimer: the durationat the beginning of a DRX Cycle; SL drx-SlotOffset: the delay beforestarting the drx-onDurationTimer; SL drx-Inactivity Timer: the durationafter the PSCCH occasion in which a PDCCH indicates a new UL or DLtransmission for the MAC entity; SL drx-RetransmissionTimer (per HARQprocess): the maximum duration until a retransmission is received; SLdrx-LongCycleStartOffset: the Long DRX cycle and drx-StartOffset whichdefines the subframe where the Long and Short DRX Cycle starts; SLdrx-ShortCycle (optional): the Short DRX cycle; SL drx-ShortCycleTimer(optional): the duration the UE shall follow the Short DRX cycle; SLdrx-HARQ-RTT-Timer (per HARQ process): the minimum duration before aassignment for HARQ retransmission is expected by the MAC entity;

For example, when the SL DRX configuration is transmitted in the secondSCI, a destination ID included in the SCI may be a groupcast destinationlayer 1 ID (i.e., some bits of a 24-bit groupcast destination layer 2ID) extracted from the 24-bit groupcast destination layer 2 ID. The SLDRX configuration may further include a source layer 1 ID extracted froma source layer 2 ID of the TX UE.

Alternatively, when the SL DRX configuration is transmitted in thesecond SCI, the destination ID included in the SCI may be a broadcastdestination layer 1 ID (i.e., some bits of a 24-bit broadcastdestination layer 2 ID) extracted from the 24-bit broadcast destinationlayer 2 ID. The SL DRX configuration may further include the sourcelayer 1 ID extracted from the source layer 2 ID of the TX UE.

For example, when SL DRX configuration information is included in thesecond SCI, first SCN may indicate whether the second SCI includes theSL DRX configuration information by an SL DRX Configuration bit. Forexample, it may be indicated whether the second SCI includes the SL DRXconfiguration information by a reserved bit of the first SCI. Forexample, when the SL DRX Configuration bit is set to 0, it may indicatethat the second SCI does not include the SL DRX configurationinformation. When the SL DRX Configuration bit is set to 1, it mayindicate that the second SCI includes the SL DRX configurationinformation.

In this case, a Release 16 legacy UE (i.e., a UE that does not supportSL DRX) may perform a conventional SCI decoding procedure, understandingthe SL DRX Configuration bit as a reserved bit. On the contrary, aRelease 17 legacy UE (i.e., a UE supporting SL DRX) may identify whetherthe second SCI includes the SL DRX Configuration from the SL DRXConfiguration bit of the first SCI. For example, when the SL DRXConfiguration bit is set to 0, it may indicate that the second SCI doesnot include the SL DRX configuration information. When the SL DRXConfiguration bit is set to 1, it may indicate that the second SCIincludes the SL DRX configuration information or the SL DRXconfiguration is delivered on a PSSCH associated with the SCI.

Further, when the second SCI does not include the whole SL DRXconfiguration information, the remaining SL DRX configurationinformation may be included in a PSSCH associated with the transmittedsecond SCI. For this purpose, the second SCI may include a “MoreSidelink DRX Configuration Bit”.

For example, when the “More Sidelink DRX Configuration Bit” included inthe second SCI is set to 0, this may imply that the whole SL DRXconfiguration information is transmitted in the second SCI. When the“More Sidelink DRX Configuration Bit” included in the second SCI is setto 1, this may imply that the whole SL DRX configuration information isnot transmitted in the second SCI and thus the remaining SL DRXconfiguration information is transmitted on the PSSCH. Alternatively,when the “More Sidelink DRX Configuration Bit” i is set to 0, this mayimply that the second SCI does not have a sufficient space for the SLDRX configuration information and thus the whole SL DRX configurationinformation may be transmitted on the PSSCH associated with the secondSCI.

FIG. 8 is a diagram illustrating an embodiment of the presentdisclosure.

Referring to FIG. 8 , UE2 may transmit a message including its own SLDRX configuration to UE1 on a PSCCH. For example, the SL DRXconfiguration may be transmitted in second SCI. UE1 may transmit agroupcast message and/or a broadcast message in the SL DRX On-Durationof UE2 based on the SL DRX configuration of UE2 without a PC5 RRCconnection with UE2.

3. Embodiment 3

According to an embodiment of the present disclosure, it is proposedthat a UE supporting DRX broadcasts its own SL DRX configuration (a DRXconfiguration for PSCCH or SCI monitoring) to a neighboring UE on aPSSCH (as groupcast data or broadcast data). The SL DRX configurationtransmitted on the PSSCH may include information described in Table 3.

TABLE 3 Sidelink DRX configurations SL drx-onDurationTimer: the durationat the beginning of a DRX Cycle; SL drx-SlotOffset: the delay beforestarting the drx-onDurationTimer; SL drx-InactivityTimer: the durationafter the PSCCH occasion in which a PDCCH indicates a new UL or DLtransmission for the MAC entity; SL drx-RetransmissonTimer (per HARQprocess): the maximum duration until a retransmission is received; SLdrx-LongCycleStartOffset: the Long DRX cycle and drx-StartOffset whichdefines the subframe where the Long and Short DRX Cycle starts; SLdrx-ShortCycle (optional): the Short DRX cycle; SL drx-ShortCycleTimer(optional): the duration the UE shall follow the Short DRX cycle; SLdrx-HARQ-RTT-Timer (per HARQ process): the minimum duration before aassignment for HARQ retransmission is expected by the MAC entity;

When the DL DRX configuration is transmitted on the PSSCH, a destinationID included in the PSSCH message may be a groupcast destination layer 2ID. In addition, the source layer 2 ID of the TX UE may also be includedin the PSSCH message.

Further, when the SL DRX configuration is transmitted on the PSSCH, thedestination ID included in the PSSCH message may be a broadcastdestination layer 2 ID. In addition, the source layer 2 ID of the TX UEmay also be included in the PSSCH message.

FIG. 9 is a diagram illustrating an embodiment of the presentdisclosure.

Referring to FIG. 9 , UE2 may transmit a message including its own SLDRX configuration to UE1 on a PSSCH. A UE may obtain SL DRX informationabout a neighboring UE by receiving a groupcast and/or broadcast PSSCHfrom the neighboring UE. UE1 may transmit a groupcast message and/or abroadcast message in the SL DRX On-Duration of UE2 based on the SL DRXconfiguration of UE2 without a PC5 RRC connection with UE2.

4. Embodiment 4

According to an embodiment of the disclosure, it is proposed that a TXUE may derive the SL DRX configuration of the other RX UE based on thelocation area/zone in which the RX UE is located and transmit agroupcast message and/or a broadcast message in the SL DRX On-Durationof the RX UE.

Conventionally, the location area of a UE, Zone ID may be mapped to anSL DRX configuration. That is, conventionally, UEs located in a similarlocation area may operate SL DRX with the same SL DRX configuration.

Upon generation of a connectionless groupcast message and/or broadcastmessage from a higher layer, the TX UE obtains an SL DRX configurationbased on its location area (e.g., Zone ID). The TX UE may transmit theconnectionless groupcast message and/or broadcast message in an obtainedSL DRX On-Duration. In this manner, even though a PC5 RRC connection isnot established between the TX UE and a neighboring RX UE, theneighboring RX UE located in the vicinity of the TX UE may receive thegroupcast message or broadcast message from the TX UE in the SL DRXOn-Duration of the RX UE.

5. Embodiment 5

A V2X UE may have a plurality of V2X service types (e.g., providerservice identifiers (PSIDs) or intelligent transport systems-applicationobject identifiers (ITS-AIDs), and each of the plurality of V2X servicetypes may haves a different service requirement or a different QoSrequirement for a service (e.g., PC5 QoS ID (PQI): PC5 5QI). A V2X UE towhich DRX is applied needs to generate an SL DRX configuration bycombining/considering service requirements corresponding to a pluralityof service types.

When a BS generates an SL DRX configuration, the UE should transmitservice requirement information corresponding to the plurality ofservice types to the BS. The BS should generate an SL DRX configurationbased on the received service requirement information and transmit theSL DRX configuration to the UE. Although the BS generates a DRXconfiguration and transmits the DRX configuration to the UE inconventional Uu communication as described above, use of this operationfor V2X communication may cause unnecessary signaling overhead.

According to an embodiment of the present disclosure, the V2X UE maygenerate an SL DRX configuration by using application informationwithout signaling with the BS. Therefore, the V2X UE may reducesignaling overhead with the BS.

FIG. 10 is a diagram illustrating an embodiment of the presentspecification.

Referring to FIG. 10 , in step S1001, application information may betransmitted from a V2X application layer of a UE to a V2X layer of theUE. The application information may specify a service type (e.g., a PSIDor an ITS-AID) and/or a V2X application requirement. For example, theapplication requirement may be a QoS requirement (e.g., PQI: PC5 5QI).There may be a plurality of service types, and V2X applicationrequirements may correspond to the respective service types. The V2Xlayer of the UE may receive application requirements corresponding tothe respective service types from the application layer.

In step S1002, the UE may generate an SL DRX configuration based on theservice type and the V2X application requirement in the V2X layer. Thatis, the V2X layer of the UE may generate the SL DRX configuration bycombining/considering the received service type and applicationrequirement information.

In step S1003, the UE may deliver the generated SL DRX configurationfrom the V2X layer to an access stratum (AS) layer.

In step S1004, the AS layer of the UE may perform SL communication withother UEs based on the received SL DRX configuration.

SL DRX information may include at least one of SL drx-onDurationTimer,SL drx-SlotOffset, SL drx-InactivityTimer, SL drx-RetransmissionTimer,SL drx-LongCycleStartOffset, SL drx-ShortCycle, SL drx-ShortCycleTimer,or SL drx-HARQ-RTT-Timer.

FIG. 11 is a diagram illustrating an embodiment of the presentdisclosure.

Referring to FIG. 11 , a higher layer (i.e., the V2X layer) of a UE maygenerate an SL DRX configuration and transmit the SL DRX configurationto the AS layer of the UE. The UE may transmit a groupcast messageand/or a broadcast message to another UE by using the SL DRXconfiguration.

In other words, the V2X layer of the UE may generate the SL DRXconfiguration and transmit the SL DRX configuration to the AS layerbased on application information and/or a V2X application requirementtransmitted from a V2X application layer of the UE to the V2X layer. Theapplication information may include service type(s) (e.g., a PSID orITS-AID).

The UE may generate the SL DRX configuration mapped to agroupcast/broadcast L2 ID in the V2X layer and transmit the SL DRXconfiguration to the AS layer. The TX UE may transmit a connectionlessgroupcast/broadcast message in the SL DRX On-Duration of an RX UE basedon the SL DRX configuration mapped to the groupcast/broadcast servicereceived from the V2X layer.

6. Embodiment 6

FIG. 12 is a diagram illustrating an embodiment of the presentdisclosure.

Referring to FIG. 12 , when a UE initiates SL communication, the UE maytransit its location information (absolute location information,relative location information, or a Zone ID), a groupcast/broadcastdestination L2 ID, and an SL DRX configuration to a BS by SL UEinformation. Thus, the BS may obtain location information aboutin-coverage UE(s) that has transmitted SL UE information, agroupcast/broadcast Destination L2 ID, and an SL DRX configuration. Whenthe BS allocates a radio resource configuration required for SLcommunication to the UE that has transmitted the SL UE information, theBS may transmit groupcast/broadcast destination L2 IDs and SL DRXconfigurations of neighboring UEs in the radio resource configuration tothe UE. The UE may transmit a connectionless groupcast/broadcast messagein the SL DRX On-Duration of a target RX UE based on the SL DRXconfigurations of its neighboring UEs included in the radio resourceconfiguration required for SL communication received from the BS.

7. Embodiment 7

FIG. 11 is a diagram illustrating an embodiment of the presentdisclosure.

Referring to FIG. 11 , a V2X application server may manage the SL DRXconfiguration of a UE through provisioning for each application serviceof the UE. Provisioning may mean allocating, disposing, and distributinginformation or resources according to user needs, and preparing them inadvance in a state where they may be used immediately when necessary.That is, the V2X application server may map an SL application service ofthe UE to the SL DRX configuration and manage them as a serviceparameter (including the DRX configuration). The V2X application layerof the UE may receive its service parameter (including the DRXconfiguration) from the V2X application server.

The UE broadcasts its SL DRX configuration on an SBCCH (an initial PC5-Sbroadcast message (i.e., PC5-S Direct Communication Request)) so that aneighboring UE may obtain the SL DRX configuration of the UE. Thus, theUE may obtain the SL DRX configuration of the neighboring UE. The TX UEmay transmit a connectionless groupcast/broadcast message in the SL DRXOn-Duration of the RX UE based on the obtained SL DRX configuration.

According to various embodiments of the present disclosure, when each UEoperating in SL DRX transmits connectionless groupcast traffic andbroadcast traffic to a target UE, the UE may obtain SL DRX configurationinformation about the target UE without establishing a PC5 RRCconnection with the target UE. Therefore, the TX UE may transmitconnectionless groupcast traffic and broadcast traffic in the SLOn-Duration section of the RX UE.

Example of Communication System to which the Present Disclosure isApplied

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 14 illustrates a communication system applied to the presentdisclosure.

Referring to FIG. 14 , a communication system applied to the presentdisclosure includes wireless devices, Base Stations (BSs), and anetwork. Herein, the wireless devices represent devices performingcommunication using Radio Access Technology (RAT) (e.g., 5G New RAT(NR)) or Long-Term Evolution (LTE)) and may be referred to ascommunication/radio/5G devices. The wireless devices may include,without being limited to, a robot 100 a, vehicles 100 b-1 and 100 b-2,an eXtended Reality (XR) device 100 c, a hand-held device 100 d, a homeappliance 100 e, an Internet of Things (IoT) device 100 f, and anArtificial Intelligence (AI) device/server 400. For example, thevehicles may include a vehicle having a wireless communication function,an autonomous driving vehicle, and a vehicle capable of performingcommunication between vehicles. Herein, the vehicles may include anUnmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may includean Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) deviceand may be implemented in the form of a Head-Mounted Device (HMD), aHead-Up Display (HUD) mounted in a vehicle, a television, a smartphone,a computer, a wearable device, a home appliance device, a digitalsignage, a vehicle, a robot, etc. The hand-held device may include asmartphone, a smartpad, a wearable device (e.g., a smartwatch or asmartglasses), and a computer (e.g., a notebook). The home appliance mayinclude a TV, a refrigerator, and a washing machine. The IoT device mayinclude a sensor and a smartmeter. For example, the BSs and the networkmay be implemented as wireless devices and a specific wireless device200 a may operate as a BS/network node with respect to other wirelessdevices.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

Example of Wireless Devices to which the Present Disclosure is Applied

FIG. 15 illustrates wireless devices applicable to the presentdisclosure.

Referring to FIG. 15 , a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 14 .

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

The wireless communication technology implemented in the wirelessdevices 100 and 200 of the present disclosure may include a narrowbandInternet of Things for low-power communication as well as LTE, NR, and6G. For example, NB-IoT may be an example of low power wide area network(LPWAN) and implemented as standards such as LTE Cat NB1 and/or LTE CatNB2, not limited to these names. Additionally or alternatively, thewireless communication technology implemented in the wireless devices100 and 200 of the present disclosure may perform communication inLTE-M. In this case, for example, LTE-M may be an example of LPWAN andcalled by various names such as enhanced machine type communication(eMTC). For example, LTE-M may be implemented as at least one of 1) LTECAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-BandwidthLimited), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTEM, not limited to these names. Additionally or alternatively, thewireless communication technology implemented in the wireless devices100 and 200 of the present disclosure may include at least one ofZigBee, Bluetooth, or LPWAN in consideration of low power communication,not limited to these names. For example, ZigBee may generate a personalarea network (PAN) related to small/low-power digital communicationbased on various standards such as IEEE 802.15.4, and may be called byvarious names.

Example of a Signal Process Circuit to which the Present Disclosure isApplied

FIG. 16 illustrates a signal process circuit for a transmission signal.

Referring to FIG. 16 , a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 16 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 15 . Hardwareelements of FIG. 16 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 15 . For example, blocks1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 15. Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 15 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 15 .

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 16 . Herein, the codewords are encoded bitsequences of information blocks. The information blocks may includetransport blocks (e.g., a UL-SCH transport block, a DL-SCH transportblock). The radio signals may be transmitted through various physicalchannels (e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 16 . For example, the wireless devices(e.g., 100 and 200 of FIG. 15 ) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

Application Example of a Wireless Device to which the Present Disclosureis Applied

FIG. 17 illustrates another example of a wireless device applied to thepresent disclosure. The wireless device may be implemented in variousforms according to a use-case/service (refer to FIG. 14 ).

Referring to FIG. 17 , wireless devices 100 and 200 may correspond tothe wireless devices 100 and 200 of FIG. 15 and may be configured byvarious elements, components, units/portions, and/or modules. Forexample, each of the wireless devices 100 and 200 may include acommunication unit 110, a control unit 120, a memory unit 130, andadditional components 140. The communication unit may include acommunication circuit 112 and transceiver(s) 114. For example, thecommunication circuit 112 may include the one or more processors 102 and202 and/or the one or more memories 104 and 204 of FIG. 15 . Forexample, the transceiver(s) 114 may include the one or more transceivers106 and 206 and/or the one or more antennas 108 and 208 of FIG. 15 . Thecontrol unit 120 is electrically connected to the communication unit110, the memory 130, and the additional components 140 and controlsoverall operation of the wireless devices. For example, the control unit120 may control an electric/mechanical operation of the wireless devicebased on programs/code/commands/information stored in the memory unit130. The control unit 120 may transmit the information stored in thememory unit 130 to the exterior (e.g., other communication devices) viathe communication unit 110 through a wireless/wired interface or store,in the memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 14 ), the vehicles (100 b-1 and 100 b-2 of FIG. 14 ), the XRdevice (100 c of FIG. 14 ), the hand-held device (100 d of FIG. 14 ),the home appliance (100 e of FIG. 14 ), the IoT device (100 f of FIG. 14), a digital broadcast terminal, a hologram device, a public safetydevice, an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 14 ), the BSs (200 of FIG. 14 ), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 17 , the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 17 will be described indetail with reference to the drawings.

Example of Hand-Held Device to which the Present Disclosure is Applied

FIG. 18 illustrates a hand-held device applied to the presentdisclosure. The hand-held device may include a smartphone, a smartpad, awearable device (e.g., a smartwatch or a smartglasses), or a portablecomputer (e.g., a notebook). The hand-held device may be referred to asa mobile station (MS), a user terminal (UT), a Mobile Subscriber Station(MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or aWireless Terminal (WT).

Referring to FIG. 18 , a hand-held device 100 may include an antennaunit 108, a communication unit 110, a control unit 120, a memory unit130, a power supply unit 140 a, an interface unit 140 b, and an I/O unit140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. Blocks 110 to 130/140 a to 140 c correspond tothe blocks 110 to 130/140 of FIG. 17 , respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signals, audio information/signals, data, and/or informationinput by a user. The I/O unit 140 c may include a camera, a microphone,a user input unit, a display unit 140 d, a speaker, and/or a hapticmodule.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

Example of a Vehicle or an Autonomous Driving Vehicle to which thePresent Disclosure is Applied

FIG. 19 illustrates a vehicle or an autonomous driving vehicle appliedto the present disclosure. The vehicle or autonomous driving vehicle maybe implemented by a mobile robot, a car, a train, a manned/unmannedAerial Vehicle (AV), a ship, etc.

Referring to FIG. 19 , a vehicle or autonomous driving vehicle 100 mayinclude an antenna unit 108, a communication unit 110, a control unit120, a driving unit 140 a, a power supply unit 140 b, a sensor unit 140c, and an autonomous driving unit 140 d. The antenna unit 108 may beconfigured as a part of the communication unit 110. The blocks110/130/140 a to 140 d correspond to the blocks 110/130/140 of FIG. 17 ,respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as othervehicles, BSs (e.g., gNBs and road side units), and servers. The controlunit 120 may perform various operations by controlling elements of thevehicle or the autonomous driving vehicle 100. The control unit 120 mayinclude an Electronic Control Unit (ECU). The driving unit 140 a maycause the vehicle or the autonomous driving vehicle 100 to drive on aroad. The driving unit 140 a may include an engine, a motor, apowertrain, a wheel, a brake, a steering device, etc. The power supplyunit 140 b may supply power to the vehicle or the autonomous drivingvehicle 100 and include a wired/wireless charging circuit, a battery,etc. The sensor unit 140 c may acquire a vehicle state, ambientenvironment information, user information, etc. The sensor unit 140 cmay include an Inertial Measurement Unit (IMU) sensor, a collisionsensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor,a heading sensor, a position module, a vehicle forward/backward sensor,a battery sensor, a fuel sensor, a tire sensor, a steering sensor, atemperature sensor, a humidity sensor, an ultrasonic sensor, anillumination sensor, a pedal position sensor, etc. The autonomousdriving unit 140 d may implement technology for maintaining a lane onwhich a vehicle is driving, technology for automatically adjustingspeed, such as adaptive cruise control, technology for autonomouslydriving along a determined path, technology for driving by automaticallysetting a path if a destination is set, and the like.

For example, the communication unit 110 may receive map data, trafficinformation data, etc. from an external server. The autonomous drivingunit 140 d may generate an autonomous driving path and a driving planfrom the obtained data. The control unit 120 may control the drivingunit 140 a such that the vehicle or the autonomous driving vehicle 100may move along the autonomous driving path according to the driving plan(e.g., speed/direction control). In the middle of autonomous driving,the communication unit 110 may aperiodically/periodically acquire recenttraffic information data from the external server and acquiresurrounding traffic information data from neighboring vehicles. In themiddle of autonomous driving, the sensor unit 140 c may obtain a vehiclestate and/or surrounding environment information. The autonomous drivingunit 140 d may update the autonomous driving path and the driving planbased on the newly obtained data/information. The communication unit 110may transfer information about a vehicle position, the autonomousdriving path, and/or the driving plan to the external server. Theexternal server may predict traffic information data using AItechnology, etc., based on the information collected from vehicles orautonomous driving vehicles and provide the predicted trafficinformation data to the vehicles or the autonomous driving vehicles.

Examples of AR/VR and Vehicle to which the Present Disclosure is Applied

FIG. 20 illustrates a vehicle applied to the present disclosure. Thevehicle may be implemented as a transport means, an aerial vehicle, aship, etc.

Referring to FIG. 20 , a vehicle 100 may include a communication unit110, a control unit 120, a memory unit 130, an I/O unit 140 a, and apositioning unit 140 b. Herein, the blocks 110 to 130/140 a and 140 bcorrespond to blocks 110 to 130/140 of FIG. 17 .

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from external devices such as other vehiclesor BSs. The control unit 120 may perform various operations bycontrolling constituent elements of the vehicle 100. The memory unit 130may store data/parameters/programs/code/commands for supporting variousfunctions of the vehicle 100. The I/O unit 140 a may output an AR/VRobject based on information within the memory unit 130. The I/O unit 140a may include an HUD. The positioning unit 140 b may acquire informationabout the position of the vehicle 100. The position information mayinclude information about an absolute position of the vehicle 100,information about the position of the vehicle 100 within a travelinglane, acceleration information, and information about the position ofthe vehicle 100 from a neighboring vehicle. The positioning unit 140 bmay include a GPS and various sensors.

As an example, the communication unit 110 of the vehicle 100 may receivemap information and traffic information from an external server andstore the received information in the memory unit 130. The positioningunit 140 b may obtain the vehicle position information through the GPSand various sensors and store the obtained information in the memoryunit 130. The control unit 120 may generate a virtual object based onthe map information, traffic information, and vehicle positioninformation and the I/O unit 140 a may display the generated virtualobject in a window in the vehicle (1410 and 1420). The control unit 120may determine whether the vehicle 100 normally drives within a travelinglane, based on the vehicle position information. If the vehicle 100abnormally exits from the traveling lane, the control unit 120 maydisplay a warning on the window in the vehicle through the I/O unit 140a. In addition, the control unit 120 may broadcast a warning messageregarding driving abnormity to neighboring vehicles through thecommunication unit 110. According to situation, the control unit 120 maytransmit the vehicle position information and the information aboutdriving/vehicle abnormality to related organizations.

Examples of XR Device to which the Present Disclosure is Applied

FIG. 21 illustrates an XR device applied to the present disclosure. TheXR device may be implemented by an HMD, an HUD mounted in a vehicle, atelevision, a smartphone, a computer, a wearable device, a homeappliance, a digital signage, a vehicle, a robot, etc.

Referring to FIG. 21 , an XR device 100 a may include a communicationunit 110, a control unit 120, a memory unit 130, an I/O unit 140 a, asensor unit 140 b, and a power supply unit 140 c. Herein, the blocks 110to 130/140 a to 140 c correspond to the blocks 110 to 130/140 of FIG. 17, respectively.

The communication unit 110 may transmit and receive signals (e.g., mediadata and control signals) to and from external devices such as otherwireless devices, hand-held devices, or media servers. The media datamay include video, images, and sound. The control unit 120 may performvarious operations by controlling constituent elements of the XR device100 a. For example, the control unit 120 may be configured to controland/or perform procedures such as video/image acquisition, (video/image)encoding, and metadata generation and processing. The memory unit 130may store data/parameters/programs/code/commands needed to drive the XRdevice 100 a/generate XR object. The I/O unit 140 a may obtain controlinformation and data from the exterior and output the generated XRobject. The I/O unit 140 a may include a camera, a microphone, a userinput unit, a display unit, a speaker, and/or a haptic module. Thesensor unit 140 b may obtain an XR device state, surrounding environmentinformation, user information, etc. The sensor unit 140 b may include aproximity sensor, an illumination sensor, an acceleration sensor, amagnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IRsensor, a fingerprint recognition sensor, an ultrasonic sensor, a lightsensor, a microphone and/or a radar. The power supply unit 140 c maysupply power to the XR device 100 a and include a wired/wirelesscharging circuit, a battery, etc.

For example, the memory unit 130 of the XR device 100 a may includeinformation (e.g., data) needed to generate the XR object (e.g., anAR/VR/MR object). The I/O unit 140 a may receive a command formanipulating the XR device 100 a from a user and the control unit 120may drive the XR device 100 a according to a driving command of a user.For example, when a user desires to watch a film or news through the XRdevice 100 a, the control unit 120 transmits content request informationto another device (e.g., a hand-held device 100 b) or a media serverthrough the communication unit 130. The communication unit 130 maydownload/stream content such as films or news from another device (e.g.,the hand-held device 100 b) or the media server to the memory unit 130.The control unit 120 may control and/or perform procedures such asvideo/image acquisition, (video/image) encoding, and metadatageneration/processing with respect to the content and generate/outputthe XR object based on information about a surrounding space or a realobject obtained through the I/O unit 140 a/sensor unit 140 b.

The XR device 100 a may be wirelessly connected to the hand-held device100 b through the communication unit 110 and the operation of the XRdevice 100 a may be controlled by the hand-held device 100 b. Forexample, the hand-held device 100 b may operate as a controller of theXR device 100 a. To this end, the XR device 100 a may obtain informationabout a 3D position of the hand-held device 100 b and generate andoutput an XR object corresponding to the hand-held device 100 b.

Examples of Robot to which the Present Disclosure is Applied

FIG. 22 illustrates a robot applied to the present disclosure. The robotmay be categorized into an industrial robot, a medical robot, ahousehold robot, a military robot, etc., according to a used purpose orfield.

Referring to FIG. 22 , a robot 100 may include a communication unit 110,a control unit 120, a memory unit 130, an I/O unit 140 a, a sensor unit140 b, and a driving unit 140 c. Herein, the blocks 110 to 130/140 a to140 c correspond to the blocks 110 to 130/140 of FIG. 17 , respectively.

The communication unit 110 may transmit and receive signals (e.g.,driving information and control signals) to and from external devicessuch as other wireless devices, other robots, or control servers. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the robot 100. The memory unit 130 may storedata/parameters/programs/code/commands for supporting various functionsof the robot 100. The I/O unit 140 a may obtain information from theexterior of the robot 100 and output information to the exterior of therobot 100. The I/O unit 140 a may include a camera, a microphone, a userinput unit, a display unit, a speaker, and/or a haptic module. Thesensor unit 140 b may obtain internal information of the robot 100,surrounding environment information, user information, etc. The sensorunit 140 b may include a proximity sensor, an illumination sensor, anacceleration sensor, a magnetic sensor, a gyro sensor, an inertialsensor, an IR sensor, a fingerprint recognition sensor, an ultrasonicsensor, a light sensor, a microphone, a radar, etc. The driving unit 140c may perform various physical operations such as movement of robotjoints. In addition, the driving unit 140 c may cause the robot 100 totravel on the road or to fly. The driving unit 140 c may include anactuator, a motor, a wheel, a brake, a propeller, etc.

Examples of AI Device to which the Present Disclosure is Applied

FIG. 23 illustrates an AI device applied to the present disclosure. TheAI device may be implemented by a fixed device or a mobile device, suchas a TV, a projector, a smartphone, a PC, a notebook, a digitalbroadcast terminal, a tablet PC, a wearable device, a Set Top Box (STB),a radio, a washing machine, a refrigerator, a digital signage, a robot,a vehicle, etc.

Referring to FIG. 23 , an AI device 100 may include a communication unit110, a control unit 120, a memory unit 130, an I/O unit 140 a/140 b, alearning processor unit 140 c, and a sensor unit 140 d. The blocks 110to 130/140 a to 140 d correspond to blocks 110 to 130/140 of FIG. 17 ,respectively.

The communication unit 110 may transmit and receive wired/radio signals(e.g., sensor information, user input, learning models, or controlsignals) to and from external devices such as other AI devices (e.g.,100 x, 200, or 400 of FIG. 14 ) or an AI server (e.g., 400 of FIG. 14 )using wired/wireless communication technology. To this end, thecommunication unit 110 may transmit information within the memory unit130 to an external device and transmit a signal received from theexternal device to the memory unit 130.

The control unit 120 may determine at least one feasible operation ofthe AI device 100, based on information which is determined or generatedusing a data analysis algorithm or a machine learning algorithm. Thecontrol unit 120 may perform an operation determined by controllingconstituent elements of the AI device 100. For example, the control unit120 may request, search, receive, or use data of the learning processorunit 140 c or the memory unit 130 and control the constituent elementsof the AI device 100 to perform a predicted operation or an operationdetermined to be preferred among at least one feasible operation. Thecontrol unit 120 may collect history information including the operationcontents of the AI device 100 and operation feedback by a user and storethe collected information in the memory unit 130 or the learningprocessor unit 140 c or transmit the collected information to anexternal device such as an AI server (400 of FIG. 14 ). The collectedhistory information may be used to update a learning model.

The memory unit 130 may store data for supporting various functions ofthe AI device 100. For example, the memory unit 130 may store dataobtained from the input unit 140 a, data obtained from the communicationunit 110, output data of the learning processor unit 140 c, and dataobtained from the sensor unit 140. The memory unit 130 may store controlinformation and/or software code needed to operate/drive the controlunit 120.

The input unit 140 a may acquire various types of data from the exteriorof the AI device 100. For example, the input unit 140 a may acquirelearning data for model learning, and input data to which the learningmodel is to be applied. The input unit 140 a may include a camera, amicrophone, and/or a user input unit. The output unit 140 b may generateoutput related to a visual, auditory, or tactile sense. The output unit140 b may include a display unit, a speaker, and/or a haptic module. Thesensing unit 140 may obtain at least one of internal information of theAI device 100, surrounding environment information of the AI device 100,and user information, using various sensors. The sensor unit 140 mayinclude a proximity sensor, an illumination sensor, an accelerationsensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGBsensor, an IR sensor, a fingerprint recognition sensor, an ultrasonicsensor, a light sensor, a microphone, and/or a radar.

The learning processor unit 140 c may learn a model consisting ofartificial neural networks, using learning data. The learning processorunit 140 c may perform AI processing together with the learningprocessor unit of the AI server (400 of FIG. 14 ). The learningprocessor unit 140 c may process information received from an externaldevice through the communication unit 110 and/or information stored inthe memory unit 130. In addition, an output value of the learningprocessor unit 140 c may be transmitted to the external device throughthe communication unit 110 and may be stored in the memory unit 130.

The above-described embodiments of the present disclosure are applicableto various mobile communication systems.

What is claimed is:
 1. A method for a first user equipment (UE)operating in a wireless communication system, the method comprising:determining a service type identified based on an intelligent transportsystems-application object identifier (ITS-AID) or a provider serviceidentifier (PSID); configuring sidelink (SL) discontinuous reception(DRX) for groupcast based on the service type and a layer-2 identifier;and monitoring first sidelink control information (SCI) based on the SLDRX, wherein the SL DRX is configured with parameters including SLdrx-onDurationTimer, SL drx-InactivityTimer, SL drx-RetransmissionTimerand SL drx-HARQ-RTT-Timer.
 2. The method according to claim 1, whereinthe parameters further includes at least one of SL drx-SlotOffset, SLdrx-LongCycleStartOffset, SL drx-ShortCycle, SL drx-ShortCycleTimer. 3.The method according to claim 1, wherein the SL DRX is transmitted toother UEs which are not connected to the first UE.
 4. The methodaccording to claim 1, wherein the SL DRX is transmitted to a second UEthrough a physical sidelink broadcast channel (PSBCH).
 5. The methodaccording to claim 1, wherein the SL DRX is transmitted to a second UEthrough second sidelink control information (SCI).
 6. The methodaccording to claim 5, wherein first SCI includes an indicator indicatingwhether the SL DRX is included in the second SCI.
 7. The methodaccording to claim 5, wherein based on a part of the SL DRX beingincluded in the second SCI, remaining SL DRX is transmitted to thesecond UE through a physical sidelink shared channel (PSSCH).
 8. Themethod according to claim 7, wherein the second SCI includes anindicator indicating whether the remaining SL DRX is included in thePSSCH.
 9. The method according to claim 1, wherein the SL DRX istransmitted to a second UE through a PSSCH.
 10. A first user equipment(UE) configured to operate in a wireless communication system, the firstUE comprising: at least one processor; and at least one computer memoryoperably coupled to the at least one processor and storing instructionswhich when executed, cause the at least one processor to performoperations, wherein the operations include: determining a service typeidentified based on an intelligent transport systems-application objectidentifier (ITS-AID) or a provider service identifier (PSID);configuring sidelink (SL) discontinuous reception (DRX) for groupcastbased on the service type and a layer-2 identifier; and monitoring firstsidelink control information (SCI) based on the SL DRX, wherein the SLDRX is configured with parameters including SL drx-onDurationTimer, SLdrx-InactivityTimer, SL drx-RetransmissionTimer and SLdrx-HARQ-RTT-Timer.
 11. A processor for performing operations for afirst user equipment (UE) configured to operate in a wirelesscommunication system, wherein the operations include: determiningservice type identified based on an intelligent transportsystems-application object identifier (ITS-AID) or a provider serviceidentifier (PSID); configuring sidelink (SL) discontinuous reception(DRX) for groupcast based on the service type and a layer-2 identifier;and monitoring first sidelink control information (SCI) based on the SLDRX, wherein the SL DRX is configured with parameters including SLdrx-onDurationTimer, SL drx-InactivityTimer, SL drx-RetransmissionTimerand SL drx-HARQ-RTT-Timer.
 12. The first UE according to claim 10,wherein the first UE communicates with at least one of another UE, a UErelated to an autonomous driving vehicle, a base station, or a network.